UC1823

更新时间： 2024-11-13 22:39:51

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
7页	411K
描述
High Speed PWM Controller

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中文翻译

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UC1823 数据手册

UC1823

UC2823

UC3823

High Speed PWM Controller

FEATURES

DESCRIPTION

•

Compatible with Voltage or Current-Mode

Topologies

The UC1823 family of PWM control ICs is optimized for high fre-

quency switched mode power supply applications. Particular care

was given to minimizing propagation delays through the compara-

tors and logic circuitry while maximizing bandwidth and slew rate

of the error amplifier. This controller is designed for use in either

current-mode or voltage-mode systems with the capability for input

voltage feed-forward.

•

Practical Operation @ Switching

Frequencies to 1.0MHz

•

50ns Propagation Delay to Output

High Current Totem Pole Output (1.5A peak)

Wide Bandwidth Error Amplifier

Protection circuitry includes a current limit comparator, a TTL com-

patible shutdown port, and a soft start pin which will double as a

maximum duty cycle clamp. The logic is fully latched to provide jit-

ter free operation and prohibit multiple pulses at the output. An un-

der-voltage lockout section with 800mV of hysteresis assures low

start up current. During under-voltage lockout, the output is high im-

pedance. The current limit reference (pin 11) is a DC input voltage to

the current limit comparator. Consult specifications for details.

Fully Latched Logic with Double Pulse

Suppression

•

Pulse-by-Pulse Current Limiting

Soft Start/Max. Duty Cycle Control

Under-Voltage Lockout with Hysteresis

Low Start Up Current (1.1mA)

These devices feature a totem pole output designed to source and

sink high peak currents from capacitive loads, such as the gate of

a power MOSFET. The on state is defined as a high level.

Trimmed Bandgap Reference (5.1V ±1%)

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (Pins 15, 13) . . . . . . . . . . . . . . . . . . . . . . . . 30V Oscillator Charging Current (Pin 5) . . . . . . . . . . . . . . . . . . -5mA

Output Current, Source or Sink (Pin14) Power Dissipation at T_A= 60 °C . . . . . . . . . . . . . . . . . . . . . 1W

DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A Storage Temperature Range . . . . . . . . . . . . . . -65°C to +150°C

Pulse (0.5µs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0A Lead Temperature (Soldering, 10 seconds) . . . . . . . . . . 300°C

Analog Inputs (Pins 1, 2, 7, 8, 9, 11) . . . . . . . . . . . -0.3V to +6V Note: All voltages are with respect to ground, Pin 10.

Currents are positive into the specified terminal.

Consult Packaging Section of Databook for thermal

limitations and considerations of packages.

Clock Output Current (Pin 4) . . . . . . . . . . . . . . . . . . . . . . . -5mA

Error Amplifier Output Current (Pin 3) . . . . . . . . . . . . . . . . 5mA

Soft Start Sink Current (Pin 8) . . . . . . . . . . . . . . . . . . . . . 20mA

BLOCK DIAGRAM

3/97

12 3 4 5 6 7

中文翻译

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UC1823 替代型号

型号	品牌	替代类型	描述	数据表
UC2823	TI	功能相似	High Speed PWM Controller

与UC1823相关器件

型号	品牌	获取价格	描述	数据表
UC1823_11	TI	获取价格	High Speed PWM Controller
UC1823A	TI	获取价格	High Speed PWM Controller
UC1823A_10	TI	获取价格	HIGH-SPEED PWM CONTROLLER
UC1823ADW	ETC	获取价格	Current/Voltage-Mode SMPS Controller
UC1823ADWTR	ETC	获取价格	Current/Voltage-Mode SMPS Controller
UC1823AJ	TI	获取价格	High Speed PWM Controller
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UC1823AL	TI	获取价格	High Speed PWM Controller
UC1823AL883B	TI	获取价格	High Speed PWM Controller

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